Denis Diderot: Biography, Achievements & Lasting Legacy

In 1751 Diderot co-created the Encyclopédie with Jean le Rond d'Alembert. It was the first encyclopedia to include contributions from many named contributors and the first to describe the mechanical arts. Its secular tone, which included articles skeptical about Biblical miracles, angered both religious and government authorities; in 1758 it was banned by the Catholic Church and, in 1759, the French government banned it as well, although this ban was not strictly enforced. Many of the initial contributors to the Encyclopédie left the project as a result of its controversies and some were even jailed. D'Alembert left in 1759, making Diderot the sole editor. Diderot also became the main contributor, writing around 7,000 articles. He continued working on the project until 1765. He was increasingly despondent about the Encyclopédie by the end of his involvement in it and felt that the entire project might have been a waste. Nevertheless, the Encyclopédie is considered one of the forerunners of the French Revolution.

Diderot struggled financially throughout most of his career and received very little official recognition of his merit, including being passed over for membership in the Académie Française. His fortunes improved significantly in 1766, when Russian Empress Catherine the Great, who had heard of his financial troubles, bought his 3,000-volume personal library, amassed during his work on the Encyclopédie, for 15,000 livres, and offered him in addition a thousand more livres per year to serve as its custodian while he lived. He received 50 years' "salary" up front from her, and stayed five months at her court in Saint Petersburg in 1773 and 1774, sharing discussions and writing essays on various topics for her several times a week.

Diderot's literary reputation during his life rested primarily on his plays and his contributions to the Encyclopédie; many of his most important works, including Jacques the Fatalist, Rameau's Nephew, Paradox of the Actor, and D'Alembert's Dream, were published only after his death.